The trend of declining sex rates over the past 30 years was "very worrying", said David Spiegelhalter. In 1990, couples made love about five times a month on average but by 2010, it was just three times.

If trends continue, by 2030 couples will have stopped having sex all together, he said.

Previously, researchers have warned that lovers are killing the mood by taking their iPads to bed. But Prof Speigelhalter, Winton Professor of the public understanding of risk at Cambridge University, blamed the rise of "massive connectivity" embodied by streaming services such as Netflix, smartphones, and television box sets.

Speaking at the Hay Festival in Wales, he said: "How many times have you had sex in the last four weeks? You can start seeing the changes in society.

"People are having less sex. Sexually active couples between 16 and 64 were asked and the median was five times in the last month in 1990, then four times in 2000 and three times in 2010.

"At this rate, by 2030 couples are not going to be having any sex at all. Which is a very worrying trend.

"The point is that this massive connectivity, the constant checking of our phones compared to just a few years ago when TV closed down at 10.30pm or whatever and there was nothing else to do. Even power cuts, which help.